U.S. patent application number 12/196500 was filed with the patent office on 2009-07-02 for standard illuminant apparatus capable of providing standard led light.
This patent application is currently assigned to INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE. Invention is credited to CHIA-YING CHANG, CHENG-HSIEN CHEN, MING-CHIEH HUANG, KUEI-NENG WU.
Application Number | 20090167189 12/196500 |
Document ID | / |
Family ID | 40797335 |
Filed Date | 2009-07-02 |
United States Patent
Application |
20090167189 |
Kind Code |
A1 |
WU; KUEI-NENG ; et
al. |
July 2, 2009 |
STANDARD ILLUMINANT APPARATUS CAPABLE OF PROVIDING STANDARD LED
LIGHT
Abstract
A standard illuminant apparatus suitable for providing a
standard optical property of LED for measurement is provided. The
standard illuminant apparatus comprises an illuminant module and
light shape control module, wherein the illuminant module is
capable of providing light, and the light shape control module is
capable of receiving the light and transforming the light shape of
the light to a predetermined light shape as a LED light shape.
Inventors: |
WU; KUEI-NENG; (Taipei City,
TW) ; CHEN; CHENG-HSIEN; (Chiayi City, TW) ;
CHANG; CHIA-YING; (Taichung City, TW) ; HUANG;
MING-CHIEH; (Taipei County, TW) |
Correspondence
Address: |
WPAT, PC
7225 BEVERLY ST.
ANNANDALE
VA
22003
US
|
Assignee: |
INDUSTRIAL TECHNOLOGY RESEARCH
INSTITUTE
Hsin-Chu
TW
|
Family ID: |
40797335 |
Appl. No.: |
12/196500 |
Filed: |
August 22, 2008 |
Current U.S.
Class: |
315/112 ;
362/257; 362/555 |
Current CPC
Class: |
F21V 13/12 20130101;
F21V 11/08 20130101 |
Class at
Publication: |
315/112 ;
362/555; 362/257 |
International
Class: |
H01J 61/52 20060101
H01J061/52; F21S 6/00 20060101 F21S006/00; F21V 3/00 20060101
F21V003/00; F21V 8/00 20060101 F21V008/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 31, 2007 |
TW |
096151383 |
Claims
1. A standard illuminant apparatus, capable of providing standard
light-emitting diode (LED) light, the standard illuminant apparatus
comprising: an illuminant module capable of providing light; and a
light shape control module capable of receiving light and
transforming the light shape of light to a predetermined light
shape as an LED light shape.
2. The standard illuminant apparatus as recited in claim 1, wherein
the light shape control module comprises: a diffuser plate; and a
first light shape control element being a first aperture disposed
on the diffuser plate and having a first opening.
3. The standard illuminant apparatus as recited in claim 1, wherein
the light shape control module is a surface-mounted LED light shape
control module, a lamp-type LED light shape control module, an
array-type LED light shape control module or a side-emitting LED
light shape control module, and the predetermined light shape is a
surface-mounted LED light shape, a lamp-type LED light shape, an
array-type LED light shape or a side-emitting LED light shape.
4. The standard illuminant apparatus as recited in claim 2, wherein
the light shape control module is a surface-mounted LED light shape
control module, and the predetermined light shape is a
surface-mounted LED light shape.
5. The standard illuminant apparatus as recited in claim 2, wherein
the light shape control module comprises: a second light shape
control element disposed over the first light shape control element
and being a predetermined pitch away from the first light shape
control element.
6. The standard illuminant apparatus as recited in claim 5, wherein
the second light shape control element is a second aperture having
a second opening and the second opening is aligned with the first
opening.
7. The standard illuminant apparatus as recited in claim 5, wherein
the second light shape control element is a lens.
8. The standard illuminant apparatus as recited in claim 6, wherein
the light shape control module is a lamp-type LED light shape
control module, and the predetermined light shape is a lamp-type
LED light shape.
9. The standard illuminant apparatus as recited in claim 7, wherein
the light shape control module is a lamp-type LED light shape
control module, and the predetermined light shape is a lamp-type
LED light shape.
10. The standard illuminant apparatus as recited in claim 5,
wherein the second light shape control element is a second aperture
having a plurality of second openings.
11. The standard illuminant apparatus as recited in claim 10,
wherein the light shape control module is an array-type LED light
shape control module, and the predetermined light shape is an
array-type LED light shape.
12. The standard illuminant apparatus as recited in claim 5,
wherein the second light shape control element is a mask being
aligned with the first opening.
13. The standard illuminant apparatus as recited in claim 7,
wherein the light shape control module comprises a mask being
disposed on the lens and aligned with the first opening.
14. The standard illuminant apparatus as recited in claim 12,
wherein the light shape control module is a side-emitting LED light
shape control module, and the predetermined light shape is a
side-emitting LED light shape.
15. The standard illuminant apparatus as recited in claim 13,
wherein the light shape control module is a side-emitting LED light
shape control module, and the predetermined light shape is a
side-emitting LED light shape.
16. The standard illuminant apparatus as recited in claim 15,
wherein the mask is disposed on one side of the lens, which is away
from the first aperture.
17. The standard illuminant apparatus as recited in claim 2,
wherein the light shape control module comprises: a diffuser pole
penetrating the first opening and being coupled to the diffuser
plate; and a mask disposed over the diffuser pole and aligned with
the first opening.
18. The standard illuminant apparatus as recited in claim 17,
wherein the diffuser plate and the diffuser pole are formed as
one.
19. The standard illuminant apparatus as recited in claim 1,
wherein the illuminant module comprises a halogen lamp.
20. The standard illuminant apparatus as recited in claim 19,
wherein the illuminant module comprises a lamp cover with the
halogen lamp formed therein.
21. The standard illuminant apparatus as recited in claim 1,
wherein the light shape control module comprises: a light emitting
diode (LED); a temperature control unit capable of detecting the
temperature of the LED; and a current control unit capable of
adjusting the current input into the LED according to the
temperature of the LED.
22. The standard illuminant apparatus as recited in claim 21,
wherein the current control unit receives the temperature of the
LED from the temperature control unit.
23. The standard illuminant apparatus as recited in claim 21,
wherein the LED is lamp-type LED.
24. The standard illuminant apparatus as recited in claim 1,
further comprising a light guide element disposed between the
illuminant module and the light shape control module, and
introducing the light from the illuminant module to the light shape
control module.
25. The standard illuminant apparatus as recited in claim 24,
wherein the light guide element is a fiber or a tube.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention:
[0002] The present invention generally relates to a standard
illuminant apparatus and, more particularly, to a standard
illuminant apparatus capable of providing standard optical property
of LED for measurement.
[0003] 2. Description of the Prior Art:
[0004] Since the light emitting diode (LED) is advantageous in long
lifetime, low power consumption, shock resistance, mass production,
light weight, compactness and fast response, it has been widely
used in general lighting, backlight modules for liquid-crystal
displays (LCD's) and automotive illumination. In general, quality
parameters for the LED include luminous intensity, luminous flux,
and chromaticity. However, the time-dependent optical property of
LED and the special light-emitting distribution lead to poor
precision in measurement. The optical property of LED depends
strongly on the temperature. For example, heat is generated in LED
chip as light is emitted from the LED. Such heat causes the
luminous intensity to change. As a result, the luminous intensity
of light from the LED measured in a period of time becomes unstable
and unreliable. Moreover, the result is different even if the same
LED is measured several days later. In other words, the
reproducibility is poor.
[0005] Consequently, parameters of the luminous intensity are
questionable especially when the same LED is measured by different
testers. Generally, an LED with better quality is used as a
standard for calibration. However, no matter how the LED is
manufactured, it exhibits poor reliability and reproducibility.
[0006] Moreover, a conventional temperature-controlled LED is also
used as standard light source. By detecting the temperature around
the LED, a current is provided to the LED so as to improve the
reliability of the LED. However, the temperature-controlled LED
still suffers from poor reproducibility.
[0007] Furthermore, the LED can be implemented in many ways, for
example, a surface-mounted LED light shape control module, a
lamp-type LED light shape control module, an array-type LED light
shape control module or an side-emitting LED light shape control
module. The manufacturing cost of the standard illuminant apparatus
is increased if the aforesaid LED's are modulated by a complicated
temperature-controlled apparatus.
SUMMARY OF THE INVENTION
[0008] It is an object of the present invention to provide to a
standard illuminant apparatus capable of providing LED light with
high reliability and high reproducibility.
[0009] In order to achieve the foregoing object, the present
invention provides a standard illuminant apparatus, comprising: an
illuminant module and a light shape control module. The illuminant
module is capable of providing light, and the light shape control
module is capable of receiving light and transforming the light
shape of light to a predetermined light shape as an LED light
shape. Thereby, the standard illuminant apparatus is capable of
providing standard LED light. In one embodiment of the present
invention, the light shape control module comprises a diffuser
plate and a first light shape control element. The first light
shape control element is a first aperture disposed on the diffuser
plate and having a first opening.
[0010] According to one embodiment of the present invention, the
illuminant module is a halogen lamp. According to another
embodiment of the present invention, the light shape control module
comprises a second light shape control element disposed over the
first light shape control element and being a predetermined pitch
away from the first light shape control element. The light shape
control module is a surface-mounted LED light shape control module,
a lamp-type LED light shape control module, an array-type LED light
shape control module or a side-emitting LED light shape control
module, and the predetermined light shape is a surface-mounted LED
light shape, a lamp-type LED light shape, an array-type LED light
shape or a side-emitting LED light shape.
[0011] Therefore, in the standard illuminant apparatus of the
present invention, the light from the illuminant module such as a
halogen lamp exhibits high reliability and reproducibility, and the
light shape control module is capable of transforming the light
shape of the halogen lamp into an LED light shape. Therefore,
according to the present invention, the standard illuminant
apparatus is capable of providing light with an LED light shape
with high reliability and reproducibility so as to be used as a
standard for calibration.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The objects, spirits and advantages of the preferred
embodiments of the present invention will be readily understood by
the accompanying drawings and detailed descriptions, wherein:
[0013] FIG. 1A is a 3-D schematic diagram showing a standard
illuminant apparatus according to one embodiment of the present
invention;
[0014] FIG. 1B is a cross-sectional view of a standard illuminant
apparatus in FIG. 1A;
[0015] FIG. 2 shows the experimental results of light shapes of an
embodiment of the present invention and conventional standard
illuminant apparatuses;
[0016] FIG. 3 is cross-sectional view of a light shape control
module according to one embodiment of the present invention;
[0017] FIG. 4A is cross-sectional view of a light shape control
module according to another embodiment of the present
invention;
[0018] FIG. 4B is a top view of the light shape control module in
FIG. 4A;
[0019] FIG. 5 is cross-sectional view of a light shape control
module according to one embodiment of the present invention;
[0020] FIG. 6A to FIG. 6C show cross-sectional views of three light
shape control modules according to another embodiment of the
present invention;
[0021] FIG. 7A and FIG. 7B show cross-sectional views of two
illuminant modules according to another embodiment of the present
invention; and
[0022] FIG. 8A and FIG. 8B show cross-sectional views of two
standard illuminant apparatuses according to another embodiment of
the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0023] The present invention can be exemplified but not limited by
the preferred embodiments as described hereinafter.
[0024] According to one embodiment of the present invention, a
light shape control module is, for example, a lamp-type LED light
shape control module, and the predetermined light shape is, for
example, a lamp-type LED light shape. Moreover, the light shape
control module comprises a diffuser plate, a first aperture and a
second aperture. The first aperture is disposed on the diffuser
plate, and comprises a first opening. The second aperture is
disposed over the first aperture, and is a predetermined pitch away
from the first aperture. The second aperture comprises a second
opening aligned with the first opening. Alternatively, the light
shape control module comprises a diffuser plate, a first aperture
and a lens. The first aperture is disposed on the diffuser plate,
and comprises a first opening. The lens is disposed over the first
aperture, and is a predetermined pitch away from the first
aperture.
[0025] According to one embodiment of the present invention, a
light shape control module is, for example, an array-type LED light
shape control module, and the predetermined light shape is, for
example, an array-type LED light shape. Moreover, the light shape
control module comprises a diffuser plate, a first aperture and a
second aperture. The first aperture is disposed on the diffuser
plate, and comprises a first opening. The second aperture is
disposed over the first aperture, and is a predetermined pitch away
from the first aperture. The second aperture comprises a plurality
of second openings.
[0026] According to one embodiment of the present invention, a
light shape control module is, for example, a surface-mounted LED
light shape control module, and the predetermined light shape is a
surface-mounted LED light shape. Moreover, the light shape control
module comprises a diffuser plate and a first aperture. The first
aperture is disposed on diffuser plate, and comprises a first
opening.
[0027] According to one embodiment of the present invention, a
light shape control module is, for example, a side-emitting LED
light shape control module, and the predetermined light shape is,
for example, aside-emitting LED light shape. Moreover, the light
shape control module comprises a diffuser plate, a first aperture
and a mask. The first aperture is disposed on the diffuser plate,
and comprises a first opening. The mask is disposed over the first
aperture, and is a predetermined pitch away from the first
aperture. The mask is aligned with the first opening.
Alternatively, the light shape control module comprises a diffuser
plate, a first aperture, a lens and a mask. The first aperture is
disposed on the diffuser plate, and comprises a first opening. The
lens is disposed over the first aperture, and is a predetermined
pitch away from the first aperture. The mask is disposed on the
lens, and is aligned with the first opening. More particularly, the
mask is disposed on one side of the lens, which is away from the
first aperture. Alternatively, the light shape control module
comprises a diffuser plate, a first aperture, a diffuser pole and a
mask. The first aperture is disposed on the diffuser plate, and
comprises a first opening. The diffuser pole penetrates the first
opening and is coupled to the diffuser plate. The mask is disposed
on the diffuser pole, and is aligned with the first opening. More
particularly, the diffuser plate and the diffuser pole are formed
as one.
[0028] According to one embodiment of the present invention, an
illuminant module is, for example, a halogen lamp. Moreover, the
illuminant module further comprises a lamp cover. The halogen lamp
is disposed inside the lamp cover. Moreover, the illuminant module
comprises an LED, a temperature control unit and a current control
unit. The temperature control unit is capable of detecting the
temperature of the LED, and the current control unit is capable of
adjusting the current input into the LED according to the
temperature of the LED. Moreover, the current control unit is, for
example, capable of receiving the temperature of the LED from the
temperature control unit. The LED is a lamp-type LED.
[0029] According to one embodiment of the present invention, the
standard illuminant apparatus further comprises a light guide
element. The light guide element is disposed between the illuminant
module and the light shape control module to introduce the light
from the illuminant module to the light shape control module.
Moreover, the light guide element is, for example, a fiber or a
tube.
[0030] FIG. 1 is a 3-D schematic diagram of a standard illuminant
apparatus according to one embodiment of the present invention; and
FIG. 1B is a cross-sectional view of a standard illuminant
apparatus in FIG. 1A. In FIG. 1A and FIG. 1B, the standard
illuminant apparatus 100 comprises an illuminant module 110 and a
light shape control module 120. The illuminant module 110 is
capable of providing light 112, and the light shape control module
120 is capable of receiving light 112 and transforming the light
shape of light 112 to a predetermined light shape as an LED light
shape. More particularly, the predetermined light shape is an LED
light shape. The light shape control module 120 is used to simulate
the LED light shape to enable the standard illuminant apparatus 100
to simulate the light from the LED as a standard for
calibration.
[0031] In the present embodiment, the illuminant module 110
comprises a halogen lamp 114 disposed inside a lamp box 116.
Compared to the LED, the light 112 from the halogen lamp 114
exhibits better reliability and reproducibility. Therefore, the
light 112 from the standard illuminant apparatus 100 exhibits high
reliability and excellent reproducibility.
[0032] Moreover, the light shape control module 120 is, for
example, a lamp-type LED light shape control module, and is capable
of transforming the light 112 from the halogen lamp 114 to a
lamp-type LED light shape. In other words, the light shape of the
light 112 from the halogen lamp 114 is simulated to a lamp-type LED
light shape.
[0033] Moreover, the light shape control module 120 comprises a
diffuser plate 122, a first aperture 124 and a second aperture 126.
The diffuser plate 122, the first aperture 124 and the second
aperture 126 are disposed inside a cover 128. The diffuser plate
122 is capable of uniformizing the light 112. The first aperture
124 and the second aperture 126 are capable of adjusting the light
shape of the light 112. More particularly, the first aperture 124
is disposed on the diffuser plate 122, and comprises a first
opening 124a. The second aperture 126 is disposed on the first
aperture 124, and is a predetermined pitch d away from the first
aperture 124. The second aperture 126 comprises a second opening
126a aligned with the first opening 124a.
[0034] Alternatively, the light shape control module comprises a
diffuser plate, a first aperture and a lens. The first aperture is
disposed on the diffuser plate, and comprises a first opening. The
lens is disposed over the first aperture, and is a predetermined
pitch away from the first aperture.
[0035] In the present embodiment, the predetermined pitch d is 3.5
mm. The diameters of the first opening 124a and the second opening
126a are preferably 3 mm and 2 mm, respectively. By adjusting these
parameters, the light shape of the light 112 can be transformed to
a lamp-type LED light shape. As a result, the standard illuminant
apparatus 100 is capable of simulating the lamp-type LED light with
high reliability and reproducibility as a standard for
calibration.
TABLE-US-00001 TABLE1 reproducibility reliability The present
invention 0.55% to 0.65% 0.23% The prior art 0.9% to 2.7% 0.1% to
0.3% (temperature-controlled LED) The prior art 3% to 10% 1.1%
(general LED)
[0036] Table 1 shows comparison of standard illuminant apparatuses
according to the present invention and the prior arts. FIG. 2 shows
the experimental results of light shapes of an embodiment of the
present invention in FIG. 1A and conventional standard illuminant
apparatuses. Referring to table 1 and FIG. 2, the standard
illuminant apparatus of the present embodiment is capable of
simulating the light shape of the light from the lamp-type LED,
even better than the light shape of the light from the lamp-type
LED. It is because the process for manufacturing the lamp-type
light emitting diode is imperfect. With the influence of the
temperature, the light shape of the light from the lamp-type LED is
actually imperfect.
[0037] Moreover, when it comes to reliability, the reliability of
the standard illuminant apparatus of the present embodiment is much
higher than the general LED and almost equal to the
temperature-controlled LED. When it comes to reproducibility, the
reproducibility of the standard illuminant apparatus of the present
embodiment is better than the general LED and the
temperature-controlled LED. Therefore, the standard illuminant
apparatus of the present invention is capable of providing light
shape of light from an LED with high reliability and excellent
reproducibility as a standard for calibration.
[0038] It is noted that the standard illuminant apparatus has to be
calibrated before the standard illuminant apparatus is used as a
standard for calibration. Generally, the technology of the
according to the present invention can be traced back to absolute
radiometric calibration of National Measurement Laboratory (NML) to
properly adjust the luminous intensity and the light shape.
Afterwards, it is used for calibrating the LED measuring apparatus
such as an optical integrating sphere used in factories or
laboratories.
[0039] It is also noted that the predetermined pitch d, the
diameter of the first opening 124a and the diameter of the second
opening 126a are only exemplary. Those with ordinary skills in the
art can make modifications without departing from the spirits of
the present invention. Moreover, the lamp-type LED light shape
control module is not limited to the aforesaid embodiment. Other
lamp-type LED light shape control modules will be described with
identical labels used for identical elements.
[0040] FIG. 3 is cross-sectional view of a light shape control
module according to one embodiment of the present invention. In
FIG. 3, the light shape control module 320 of the present
embodiment, wherein the light shape control module 320 is a
lamp-type LED light shape control module, is similar to the
aforesaid light shape control module 120 (as shown in FIG. 1B)
except that the light shape control module 320 uses a lens 326 to
replace the second aperture 126. Similarly, by adjusting the
predetermined pitch d, the diameter of the first opening 124a and
the curvature of the lens 326, the light shape of the light 112 can
be transformed to a lamp-type LED light shape.
[0041] It is also noted that the light shape control module is only
exemplified by but not limited to the lamp-type LED light shape
control module.
[0042] FIG. 4A is cross-sectional view of a light shape control
module according to another embodiment of the present invention;
and FIG. 4B is a top view of the light shape control module in FIG.
4A. Referring to FIG. 4A, 4B, the light shape control module 420 of
the present embodiment is an array-type LED light shape control
module. The light shape control module 420 of the present
embodiment is different from the light shape control module 120 (as
shown in FIG. 1B) in that the second aperture 426 comprises a
plurality of second openings 426a. Similarly, by adjusting the
predetermined pitch d, the diameter of the first opening 124a and
the diameter of the second opening 426a, the light shape of the
light 112 can be transformed to an array-type LED light shape.
[0043] FIG. 5 is cross-sectional view of a light shape control
module according to one embodiment of the present invention.
Referring to FIG. 5, the light shape control module 520 of the
present embodiment is a surface-mounted LED light shape control
module. The light shape control module 520 of the present
embodiment is different from the light shape control module 120 (as
shown in FIG. 1B) in that the second aperture 126 is not disposed
in the light shape control module 520. Similarly, by adjusting the
diameter of the first opening 124a, the light shape of the light
112 can be transformed to a surface-mounted LED light shape.
[0044] FIG. 6A to FIG. 6C show cross-sectional views of three light
shape control modules according to another embodiment of the
present invention. These three light shape control modules are all
side-emitting LED control modules. Referring to FIG. 6A, the light
shape control module 620a of the present embodiment is similar to
the light shape control module 120 (as shown in FIG. 1B) except
that the light shape control module 620a uses a mask 626 to replace
the second aperture 126. The mask 626 is aligned with the first
opening 124. Similarly, by adjusting the predetermined pitch d, the
diameter of the first opening 124a, the area of the mask 626, and
the light shape of the light 112 can be transformed to a
side-emitting LED light shape.
[0045] Referring to FIG. 6B, the light shape control module 620a of
the present embodiment is similar to the light shape control module
620a (as shown in FIG. 6A) except that the light shape control
module 620b further comprises a lens 629. More particularly, the
lens 629 is disposed over the first aperture, and is a
predetermined pitch d away from the first aperture 124. Moreover,
the mask 626 is disposed on the lens 629, and is aligned with the
first opening 124. Similarly, by adjusting the predetermined pitch
d, the diameter of the first opening 124a, the curvature of the
lens 629 and the area of the mask 626, the light shape of the light
112 can be transformed to a side-emitting LED light shape.
[0046] It is also noted that the mask 626 is disposed on one side
of the lens 629, which is away from the first aperture 124.
However, in other embodiment, the mask 626 can be disposed on one
side of the lens 629, which is close to the first aperture 124.
[0047] Referring to FIG. 6C, the light shape control module 620c of
the present embodiment is similar to the light shape control module
620a (as shown in FIG. 6A) except that the light shape control
module 620c further comprises a diffuser pole 621. More
particularly, the diffuser pole 621 penetrates the first opening
124a and is coupled to the diffuser plate 122. The mask 626 is
disposed on the diffuser pole 621, and is aligned with the first
opening 124. Similarly, by adjusting the predetermined pitch d, the
diameter of the first opening 124a, the curvature of the lens 629
and the area of the mask 626, the light shape of the light 112 can
be transformed to a side-emitting LED light shape. Moreover, even
though the diffuser pole 621 and the diffuser plate 122 are formed
individually in the present embodiment. However, in other
embodiments, the diffuser pole 621 and the diffuser plate 122 can
be formed as one.
[0048] In the prior art, different LED's are used according to
respective standard light. If these different LED's are implemented
using temperature-controlled LED's, the cost for manufacturing the
standard illuminant apparatus will be very high. In the present
invention, different LED light shapes can be implemented by
changing the internal elements in the light shape control module.
Therefore, the manufacturing cost of the standard illuminant
apparatus is significantly reduced.
[0049] Moreover, the high-reliability illuminant module used with
the LED light shape control module can be used to simulate true LED
light as standard light. Those with ordinary skills in the art cam
make modifications on the illuminant module and/or the light shape
control module within the scope of the present invention. For
example, the illuminant module can be further modified as described
hereinafter.
[0050] FIG. 7A and FIG. 7B show cross-sectional views of two
illuminant modules according to another embodiment of the present
invention. Referring to FIG. 7A, the illuminant module 710a of the
present embodiment is similar to the illuminant module 110 (as
shown in FIG. 1B) except that the illuminant module 710a further
comprises a lamp cover 716. The halogen lamp 114 is disposed inside
the lamp cover 716 so that the halogen lamp 114 is capable of
providing uniform light 112.
[0051] Referring to FIG. 7B, the illuminant module 710b of the
present embodiment is similar to the illuminant module 110 (as
shown in FIG. 1B) except that the illuminant module 710b is a
temperature-controlled LED 714 instead of the halogen lamp 114.
More particularly, the temperature-controlled LED 714 comprises an
LED 714a, a temperature control unit 714b and a current control
unit 714c. The temperature control unit 714b is capable of
detecting the temperature around the LED 714a, and the current
control unit 714c receives the temperature of the LED 714a from the
temperature control unit 714b. The current control unit 714c
adjusts the current input into the LED 714a according to the
temperature of the LED 714a.
[0052] In the present embodiment, the LED 714a is a lamp-type LED.
It is noted that, even though the LED 714a is a lamp-type LED, the
corresponding light shape control module is not restricted to a
lamp-type LED light shape control module. In other words, the light
shape control module can also be an array-type LED light shape
control module or a surface-mounted LED light shape control module.
The present invention is not limited to any type of light shape
control modules.
[0053] FIG. 8A and FIG. 8B show cross-sectional views of two
standard illuminant apparatuses according to another embodiment of
the present invention. Refer to FIGS. 8A and 8B, the standard
illuminant apparatuses 800a, 800b of the present embodiment are
similar to the standard illuminant apparatus 100 except that the
standard illuminant apparatuses 800a, 800b further comprise a light
guide element 830. The light guide element 830 is disposed between
the illuminant module 110 and the light shape control module 120 to
transmit light from the illuminant module 110 to the light shape
control module 102. More particularly, the light guide element 830a
in FIG. 8A is a fiber. The light guide element 830b in FIG. 8B is a
tube. However, the present invention is not limited to any type of
light guide elements.
[0054] Accordingly, the standard illuminant apparatus according to
the present invention comprises at least advantages of:
[0055] 1. Since the light from the illuminant module such as a
halogen lamp exhibits high reliability and excellent
reproducibility and the light shape control module is capable of
transforming the light shape of light from the halogen lamp to an
LED light shape, the standard illuminant apparatus is capable of
providing light with an LED light shape exhibiting high reliability
and excellent reproducibility as a standard for calibration.
[0056] 2. Different LED light shapes can be implemented by changing
the internal elements in the light shape control module. Therefore,
the manufacturing cost of the standard illuminant apparatus is
significantly reduced.
[0057] Although this invention has been disclosed and illustrated
with reference to particular embodiments, the principles involved
are susceptible for use in numerous other embodiments that will be
apparent to persons skilled in the art. This invention is,
therefore, to be limited only as indicated by the scope of the
appended claims.
* * * * *